Throttle pedal actuated throttle return

ABSTRACT

A throttle lever for pivoting a carburetor throttle valve is coupled by a yieldable coupling device to normally follow the movement of a throttle linkage operable with an actuating force applied thereto to move the throttle valve towards a full open position. The throttle lever is also connected to a vacuum motor controlled by a solenoid valve to have a normal condition for permitting the throttle valve to be normally controlled through the throttle linkage and, alternatively, a throttle return condition for overcoming the bias of the coupling device and returning the throttle valve to an idle position when the throttle linkage is prevented from normally doing so. Electrically connected with the solenoid is a switch actuatable by a linkage lever comprising a portion of the throttle linkage and having a pivot section. The pivot section is supported by a pivot support so as to be pivotable about a pivot axis and movable laterally thereto to cause the switch to establish the vacuum motor in the normal and throttle return conditions on the respective application and removal of actuating force.

United States Patent 1191 Stoltman 1451 Sept. 11, 1973 [75] Inventor:Donald D. Stoltman, Henrietta, NY.

[73] Assignee: General Motors Corporation,

Detroit, Mich.

22 Filed: July 24, 1972 21 Appl. No.: 274,577

[52] US. Cl. 123/198 DB, 123/98, 123/108, 180/82 [51] Int. Cl... F02b77/08, F02d 11/04, 360k 27/08 [58] Field of Search 123/198 D, 198 DB,123/198 DC, 98,108,103 C, 103 D, 103 E,

Primary ExaminerAl Lawrence Smith AltorneyE. W. Christen et al.

[57] ABSTRACT A throttle lever for pivoting a carburetor throttle valveis coupled by a yieldable coupling device to normally follow themovement of a throttle linkage operable with an actuating force appliedthereto to move the throttle valve towards a full open position, Thethrottle lever is also connected to a vacuum motor controlled by asolenoid valve to have a normal condition for permitting the throttlevalve to be normally controlled through the throttle linkage and,alternatively, a throttle return condition for overcoming the bias ofthe coupling device and returning the throttle valve to an idle positionwhen the throttle linkage is prevented from normally doing so.Electrically connected with the solenoid is a switch actuatable by alinkage lever comprising a portion of the throttle linkage and having apivot section. The pivot section is supported by a pivot support so asto be pivotable about a pivot axis and movable laterally thereto tocause the switch to establish the vacuum motor in the normal andthrottle return conditions on the respective application and removal ofactuating force.

4 Claims, 5 Drawing Figures z; fry

PATENTED SEP] 1 I975 saw 1 or PMENTEB 3.757. 758

saw a M 2 THROTTLE PEDAL ACTUATED THROTTLE RETURN This invention relatesto throttle controls having a throttle pedal linkage for normallycontrolling the position of a throttle valve and more particularly to athrottle control for returning the throttle valve to its idle positionwhen the throttle pedal linkage is prevented from normally doing so.

The present invention provides a throttle control wherein a throttlelever for pivoting a carburetor throttle valve is biased by a returnspring to normally return the throttle valve in a throttle closingdirection to an idle position and is coupled by a yieldable couplingdevice to normally follow the movement in a throttle opening directionof a throttle linkage including a pedal lever pivotably mounted tosuspend a vehicle throttle pedal from a vehicle firewall. The carburetorthrottle lever is also connected to a vacuum motor controlled by asolenoid valve to have a normal condition for permitting the throttlevalve to be normally controlled through the throttle linkage andalternatively a throttle return condition for overcoming the bias of thecoupling device and returning the throttle valve to its idle positionwhen the throttle linkage is prevented from normally doing so. The pedallever has a pivot section supported by a pivot support to be pivotableabout a pivot axis and movable laterally thereto to an actuated positionon application of an actuating force to the throttle pedal. Removal ofthe actuating force permits foam pads to bias the pedal lever translatedto a nonactuated position. Operatively connected with the pedal lever tobe actuatable by the pivot section on the lateral movement thereof is apedal lever switch for establishing the vacuum motor in the normalcondition when the pivot section is in the actuated position and in thereturn condition when in the non-actuated position.

It is an object of the present invention to provide a throttle controlincluding a throttle linkage for normally controlling a throttle valveof an internal combustion engine carburetor and a control deviceresponsive to removal of actuating force from the throttle linkage toactuate a throttle return apparatus to return the throttle valve to anidle position when the throttle linkage is prevented from normally doingso.

It is another object of the present invention to provide a throttlecontrol including a throttle valve return apparatus that is actuated toreturn a throttle valve of an internal combustion engine carburetor toan idle position in response to removal of throttle actuating force whena pivotable throttle linkage lever is moved laterally to a pivot axis tooperate a switch.

It is another object of the present invention to provide a throttlecontrol having a vacuum motor that is actuated through a control deviceto return a throttle valve of an internal combustion engine carburetorto its idle position, the control device including a switch actuatableby a throttle pedal lever having a pivot section that is pivotable abouta pivot axis and movable later ally thereto in response to theapplication and removal of actuating force from the pedal lever.

It is another object of the present invention to provide in an internalcombustion engine throttle control having a throttle lever for pivotinga carburetor throttle valve between open and closed positions, acoupling spring for coupling the throttle lever to normally follow themotions of a vehicle throttle linkage when an actuating force is appliedthereto, and a vacuum motor for overcoming the bias of the couplingspring and returning the throttle valve to its idle position should thethrottle linkage be prevented from normally doing so when the actuatingforce is removed therefrom.

These and other objects and advantages of the present invention may bebetter understood with reference to the following description taken inconjunction with the attached drawings, wherein:

FIG. 1 is a view of one vehicle throttle control provided in accordancewith the present invention;

FIG. 2 is an enlarged perspective view of an exploded throttle pedalsupport for supporting a vehicle throttle pedal and comprising a portionof the throttle control of FIG. 1;

FIG. 3 is an enlarged view through a cross-section of the throttle pedalsupport assembly of FIG. 2 when no actuating force is applied to thevehicle throttle pedal thereof;

FIG. 4 is an enlarged view through a cross-section of the throttle pedalsupport assembly of FIG. 2 when actuating force is applied to thevehicle throttle pedal thereof;

FIG. 5 is a view partially in schematic and partially in cross-sectionof another embodiment of another throttle control provided in accordancewith the present invention.

With reference now to FIG. 1, there is shown a throttle control forpermitting a vehicle operator to control an internal combustion engine11 from a remote location. Throttle control 10 includes a carburetor 12having a throttle valve 14 pivotable in a throttle bore 15 on a throttleshaft 16 to control the flow of fuel to engine 1 l. Throttle valve 14 ispivoted between an idle position 14 and a full open position 14" by athrottle lever 18 fixed to throttle shaft 16 and biased in a throttleclosing direction by a throttle return spring 20.

Throttle lever 18, as described in greater detail below, is yieldablyconnected through a spring loaded coupling device 22 to a pedal lever 24that suspends a vehicle throttle pedal 25 from a vehicle firewall 26 andpivots throttle lever 18 in a throttle opening direction when anactuating force is applied to pedal 25. Also connected to throttle lever18 is a pressure-differentialoperated vacuum motor 28 controlled by asolenoid valve 30 to have a normal condition for allowing throttle lever18 to be normally controlled by return spring and throttle pedal andalternatively a throttle return condition for returning throttle lever18 to its idle position. As also described in further detail below,pedal lever 24 includes a pivot section 32 supported by a support andswitch assembly 34 to be pivotable about a pivot axis 35 and movablelaterally to pivot axis 35 between an actuated position and anon-actuated position in response to the application and removal of anactuating force to throttle pedal 25. 1

Support and switch assembly 34 contains a pedal switch 36 electricallyconnected by a conductor 37 to solenoid valve and actuatable by pedallever 24 with lateral movement thereof to establish the vacuum motor 28in the normal and return conditions in response to the application andremoval of actuating force to throttle pedal 25. The circuit forenergizing solenoid valve 30 includes an ignition switch 38 and pedalswitch 36 connected in series between a source of electrical power 39and one terminal of solenoid valve 30,

the other terminal of which is grounded at a suitable ground 40. Withignition switch 38 closed, solenoid valve 30 is energized whenever pedalswitch 36 is biased closed upon the removal of actuating force fromthrottle pedal 25, such cooperation between switch 36 and pedal 25 alsobeing hereinafter described in greater detail.

Vacuum motor 28 has a vacuum chamber 42 separated from an atmosphericchamber 44 by a flexible diaphragm 46 having an actuator rod 48extending loosely through an atmospheric port 50 and connected tothrottle lever 18 by a flexible chain 52 passing under a pulley 54.Vacuum chamber 42 communicates with an engine vacuum provided in aninduction passage 56 of engine 1 1 through a conduit 58 having a flowrestriction 59 to limit vacuum loss while solenoid valve 30 vents vacuumchamber 42 to atmosphere. With vacuum chamber 42 vented when solenoidvalve 30 is deenergized, diaphragm 46 and actuator rod 48 are free tofollow the motion imparted to throttle lever 18 from throttle pedal 25through coupling device 22. When throttle lever 18 is not biased in athrottle opening direction by pedal lever 24, diaphragm 46 is biased byits natural resiliency to spring back to a central position in vacuummotor 28 thereby keeping chain 52 taut on pulley 54. When energized,solenoid valve 30 is closed to actuate vacuum motor 28 with enginevacuum so that throttle lever 18 is pulled by chain 52 to pivot throttlevalve 14 in the closing direction to its idle position, such positionbeing effected when a slow idle adjustment lever (not shown) affixed tothrottle shaft 16 abuts against a stop (also not shown) jutting from theexterior of carburetor 12.

To permit vacuum motor 28 when actuated to return throttle valve 14 toits idle position regardless of the position of pedal lever 24, shouldlever 24 be prevented from moving normally in the counterclockwisethrottle closing direction, spring loaded coupling device 22 includes apair of throttle rods 60 and 62, one end of each being connectedrespectively to throttle lever 18 and pedal lever 24 and the other endsof which are biased in opposite directions by a throttle rod couplingspring 64 contained in a cylinder 66. Coupling spring 64 urges a springstop 68 on the right end as viewed in FIG. 1 of throttle rod 60 tonormally abut against a stop wall 70 at one end of cylinder 66 and awayfrom another wall 71 at the other end.

The torque applied by vacuum motor 28 when actuated to throttle lever 18is sufficient when pedal lever 24 is prevented from moving normally in athrottle closing direction to overcome the bias of throttle rod couplingspring 64 so that spring stop 68 compresses spring 64 against cylinderend wall 71 as throttle rod arm 60 is retracted in a leftward throttleclosing direction. Moreover, the effective length of travel of springstop 68 when compressing spring 64 in cylinder 66 is sufficient topermit throttle lever 18 to return throttle valve 14 to its idleposition 14 from any position including its full open position 14".However, to normally permit throttle lever 18 to be accuratelypositioned by the actuation of throttle pedal 25, the bias of throttlerod coupling spring 64 is made greater than the return bias of returnspring 20 so that when throttle pedal 25 is actuated in a throttleopening direction against the bias of return spring 20, return spring 20yields and coupling spring 64 normally does not.

As may be better understood in conjunction with FIGS. 2, 3, and 4, pivotsection 32 of pedal lever 24 is of a generally circular cross-sectionextending along pivot axis 35 therethrough and is integral with anextends horizontally between a pair of generally vertical upper andlower lever arms 74 and 76 that are operatively connected with throttlerod arm 62 and throttle pedal 25, respectively. Pivot section 32 fitsinto the horizontal width of a cavity 80 in a molded plastic supportbracket 78 comprising a portion of support and switch assembly 34.Bracket 78 has a pair of horizontally spaced bearing members 82 and 84upstanding from a floor 86 of cavity 80 to support pivot section 32 andproviding bearing channels to allow slight translation of pivot section32 in a direction transverse to pivot axis 35 while allowing pedal lever24 to be pivoted thereabout.

To prevent binding thereof against the sides of cavity 80, pivot section32 is centrally located therein by a positioning pin 88 extendingthrough suitable guide apertures in a smooth plastic sheet 90 and amounting plate 92. Sheet 90 and mounting plate 92 are guided onto a flatclamping surface 94 provided by the top surfaces of bearing members 82and 84, by the top surfaces of a pair of vertical support walls 96 and98 connecting bearing members 82 and 84 with the top and bottom sides ofcavity 80, and also by the top surfaces of a pair of support walls 100and 102 extending generally horizontally between vertical support walls96 and 98. Support bracket 78 with pivot section 32 supported and retained therein is affixed to firewall 26 by a pair of screws 104 and 106passing through clamping plate 92, sheet 90, and suitable apertures 108and 110.

Throttle pedal 24 and support bracket 78 hereinabove described may be ofthe types provided in certain commercial vehicles produced by theGeneral Motors Corporation and may correspond for example with those onpage 6M-28 of the 1970 Oldsmobile Chassis Service Manual. However, toprovide support and switch assembly 34 for use with the presentinvention, support bracket 78 is then augmented by a pair of foam pads112 and 114 located in cavity 80 on floor 86 thereof so as to bound agenerally rectangular centrally located pocket 116 defined in cavity 80between support walls 96, 98, 100 and 102. Also added is a fixed switcharm 1 l8 and a movable switch arm 120, the free ends of which normallycontact each other in pocket 116 to provide switch 36 and the fixed endsof which are cemented by cement 122 in holes through upper and lowersupport walls 100 and 102 and also in the upper and lower sides ofcavity 80. Lastly, another smooth plastic sheet 126 is fitted betweenpivot section 32 and movable switch arm to electrically isolate pedallever 24 from switch 36 and to provide a smooth surface on which pivotsection 32 may be provided. Plastic sheet 126 has a horizontal widthslightly less than the space between bearing members 82 and 84 and has alength slightly less than the space between upper and lower walls 100and 102, the upper left-hand corner of sheet 126 being cut out so as tonot bear on fixed switch arm 118 when actuated by pivot section 32 whenmoved laterally.

As may be better understood with reference to FIG. 2, in conjunctionwith FIGS. 3 and 4, bearing members 82 and 84 each comprise a pair ofchannel surfaces 130 and 132 that are separated by a slot channel 85,the length of which provides a clearance 134 to a bottom 133 of channel85 when pivot section 32 is biased by foam pads 112 and 114 to anon-actuated position against sheet 90 with no actuating force on pedal25. A clearance 136, smaller than clearance 134 by the thickness ofsheet 126, is provided between a top sur face 138 of sheet 126 and theouter diameter of pivot section 32 when in the non-actuated positionwith no actuating forces on pedal 25. In such position, movable switcharm 120 is in a resilient contact with fixed contact arm 118 as bestseen in FIG. 2. When actuating force is applied to the throttle pedal25, pedal lever 24 in addition to normally opening throttle valve 14actuates pedal switch 36 through an actuator such as provided by pivotsection 32 of the present embodiment. Pedal lever 24 is moved laterallyto the left as viewed in the figures in a direction transverse to thedirection of pivot axis 35 against the bias of the foam pads 112 and 114to cause pivot section 32 to first take up that portion of clearance 134comprised by clearance 136 until contact is made with top surface 138 ofsheet 126 and to then take up the remaining portion of clearance 134until contacting the bottoms 133 of channels 85. In taking In taking upthis remaining portion of clearance 134, pivot section 32 urges sheet126 against movable contact arm 120 to break the electrical contact withfixed contact arm 118. With pivot section 32 held in contact with thebottoms 133 of bearing member channels 85 by actuating force applied tothrottle pedal 25, bearing bottoms 133 provide a fulcrum on which pedallever 24 is pivoted about pivot axis35 to open the throttle valve 14towards its full opening position 14" while the periphery of pivotsection 32 sliding on sheet 126 holds switch 36 open as lever 24 pivots.

Thus, with no actuating force on pedal 25, foam pads 1 12 and 114 applya return bias urging pivot section 32 to the non-actuated positionagainst sheet 90 allowing switch 36 to be in a normally closed ornonactuated condition. When an actuating force is applied to throttlepedal 25, pivot section 32 is forced in a direction to overcome thereturn bias of pads.112 and 114 and the resiliency of movable switch arm120. Pivot section 32 as it is moved laterally towards the actuatedposition determined by abutment with bearing bottoms 133 actuates switch36 to its open or actuated condition wherein contact arms 118 and 120are held open by pivot section 32. Upon release of actuating force fromthrottle pedal 25,'foam pads 112 and 114 cooperate with the resiliencyof movable arm 120 to move pivot section 32 rightwardly to itsnon-actuated position wherein switch 36 is again returned to itsnormally closed or non-actuated condition.

Another embodiment of the invention may be better understood withreference to FIG. 5 wherein components having a structure and operationlike those of FIG. 1 are denoted by like designators. The primarydifference between the FIG. 1 and FIG. 5 embodiments is that theyieldable coupling device 22 of the FIG. 1 embodiment is replaced byalever coupling spring 140 that yieldably biases throttle lever 18 and tonormally follow a second throttle. lever 142 loose on throttle shaft 16and pivotable in the throttle opening direction by a throttle rod 146connected to upper pedal lever arm 74. Lever coupling spring 140 biaseslevers 18 and 142 in opposite directions on throttle shaft 16 until astop 144 on throttle lever 142 normally engages throttle lever 18. Thebias of lever coupling spring 140 is greater than return spring 20 sothat return spring 20 yields and throttle levers 18 and 142 normallymove conjointly when pedal lever 24 is pivoted on pivot axis 35.However, should pedal lever 24, throttle rod 146, or throttle lever 142for some reason be prevented from moving in the throttle closingdirection with throttle lever 18, vacuum motor 28 when actuated forceslever 18 with a force sufficient to overcome the bias of lever couplingspring 140 to pivot lever 18 in a counterclockwise closing directionrelative to second throttle lever 142 so that lever 18 returns throttlevalve 14 to its idle position.

OPERATION In normal operation of the FIG. 1 and 5 embodiments, with noactuating force on throttle pedal 25, throttle valve 14 is normallyreturned to idle position 14 by return spring 20 and pivot section 32 isheld in its rightward non-actuated position by the bias applied by foampads 112 and 114. Pedal lever switch 36 is in:

its normally closed condition wherein it completes the circuit forenergizing solenoid valve 30 with power from vehicle battery 39 throughignition switch 38. Thus energized, solenoid valve 30 closes the ventfrom vacuum chamber 42 so that vacuum communicated thereto frominduction passage 56 through conduit 58 provides a pressure differentialacross vacuum motor diaphragm 46 forcing throttle lever 18 in acounterclockwise direction. However, with throttle valve 14 stopped fromturning further in a throttle closing direction by abutment between thecarburetor idle stop and the slow idle lever affixed to throttle shaft16, actuation of vacuum motor 28 under these circumstances merely holdsthrottle lever 18 in its idle position.

Application of actuating force to throttle pedal 25 moves pivot section32 laterally to pivot axis 35 in bearing channel of lever bearingmembers 82 and 84 against the bias of foam pads 112 and 114 as the pedallever 24 pivots slightly in a counterclockwise direction againstresistance provided at upper lever arm 74 by throttle rod 62 in the caseof the FIG. 1 embodiment or throttle rod 146 in the case of the FIG. 5embodiment. Pivot section 32 as it is moved leftwardly in bearingchannel 85 contacts sheet 126 and therethrough actuates switch 36 byforcing movable switch arm thereof out of contact with fixed switch arm118, thereby interrupting the energization circuit for solenoid valve30. Leftward lateral movement of pivot section 32 continues untilcontact is made with the bottom surfaces 133 of lever bearings 82 and 84to determine the actuated position of pedal lever 24. Pivot section 32is then pivoted in a clockwise direction about pivot axis 35therethrough while held in a sliding contact between sheet 126 andbottoms 133 of bearings 82 and 84. Pedal lever 24 when so pivoted pivotsthrottle lever 18 in the clockwise throttle opening direction toposition throttle valve 14 in a position intermediate its idle position14' and its full open position 14?.

Normally, subsequent removal of actuating force from throttle pedal 25results in throttle valve 14 being returned to its idle positionby thebias of return spring 20, pedal lever 24 following such closing movementby being pivoted in the counterclockwise direction about pivot axis 35.However, should pedal lever 24 for some reason be prevented frompivoting normally in the counterclockwise direction to follow motion ofthrottle leverl8, the closure of pedal switch 36 associated with thereturn translation of pivot section 32 to its nonactuated position byfoam pads 112 and 114 actuates vacuum motor 28 to force throttle lever18 in the throttle closing direction-With pedal lever 24 affixed tocoupling cylinder 22 in the case of the P16. 1 embodiment or to secondthrottle lever 142 in the case of the FIG. 5 embodiment, actuation ofvacuum motor 28 when pedal lever 24 does not follow throttle lever 18causes coupling spring 64 in the case of the FIG. 1 embodiment, orspring 140 in the case of the FIG. 5 embodiment, to yield as throttlelever 18 is pivoted in the counterclockwise throttle closing directionrelative to throttle rod 62 or 146. Such yielding permits vacuum motor28 to pivot throttle lever 18 until throttle valve 14 is returned to itsidle position regardless of the position of pedal lever 24 or throttlerods 62 or 146.

Having described two embodiments of the present invention, it isunderstood that the specific terms and examples are employed in thedescriptive sense only and not for the purpose of limitation. Otherembodiments of the invention, modifications thereof, and alternativesthereto may be used. I therefore aim in the appended claims to coversuch modifications and changes as are within the true scope and spiritof my invention.

What I claim as new and desire to secure by letters patent of the UnitedStates is:

1. In a vehicle:

a. an internal combustion engine;

b. a carburetor having a throttle valve for controlling said engine anda throttle lever for pivoting said throttle valve between an idleposition and a full open position;

c. throttle linkage means connected with said throttle lever forpermitting a vehicle operator to control said engine by moving saidthrottle valve in a throttle opening direction towards said full openposition, said linkage means including a return spring for biasing saidthrottle lever in a throttle closing direction towards said idleposition, a linkage lever having a pivot section, pivot support meansfor supporting said pivot section in one limiting position to pivotabout an axis and permitting lateral movement of said pivot sectionrelative to said axis to another limiting position, biasing means fornormally yieldingly holding said pivot section in said other limitingposition and yielding to movement of said pivot section to said onelimiting position by a throttle actuating force applied to said linkagelever, and yieldable coupling means connected between said throttlelever and said linkage lever and including spring means for normallycoupling one of said levers to move with the other and alternativelyyielding to permit said throttle lever to be moved in said closingdirection relative to said linkage lever when said throttle lever isforced with a bias greater than the bias of said return spring;

d. throttle return means connected to said throttle lever operable in anormal condition to permit said throttle lever to be normally controlledby said linkage lever and said return spring and alternatively in athrottle return condition to overcome the bias of said coupling meansand return said throttle lever to said idle position when said throttlelinkage means is prevented from normally doing so; and

e. throttle return control means for controlling said throttle returnmeans and including switch means operatively connected with said linkagelever to be actuated thereby on lateral movement of said pivot sectionto said one limiting position to establish said throttle return means insaid normal condition on application of said actuating force andalternatively to be actuated thereby on lateral movement of said pivotsection to said other limiting position to establish said throttlereturn means in said throttle return condition upon removal of saidactuating force.

2. in a vehicle: a. an internal combustion engine; b. a carburetorhaving a throttle valve for controlling said engine and a throttle leverfor pivoting said throttle valve between an idle position and a fullopen position;

. throttle linkage means connected with said throttle lever forpermitting a vehicle operator to control said engine from a remotelocation by moving said throttle valve in a throttle opening directiontowards said full open position, said linkage means including a returnspring for biasing said throttle lever in a throttle closing directiontowards said idle position, a linkage lever having a pivot section,pivot support means for supporting said pivot section in one limitingposition to pivot about an axis and permitting lateral movement of saidpivot section relative to said axis to another limiting position, athrottle pedal for pivoting and laterally moving said linkage lever,biasing means for normally yieldingly holding said pivot section in saidother limiting position and yielding to movement of said pivot sectionto said one limiting position by a throttle actuating force applied tosaid linkage lever, and yieldable coupling means connected between saidthrottle lever and said linkage lever and including spring means fornormally coupling one of said levers to move with the other andalternatively yielding to permit said throttle lever to be moved in saidclosing direction relative to said linkage lever;

d. throttle return means connected to said throttle lever operable in anormal condition to permit said throttle lever to be normally controlledby said linkage lever and said return spring and alternatively in athrottle return condition to overcome the bias of said coupling meansand return said throttle lever to said idle position when said throttlelinkage means between said yieldable coupling means and said throttlepedal is prevented from normally doing so; and

. throttle return control means for controlling said throttle returnmeans and including switch means operatively connected with said linkagelever to be actuated thereby on lateral movement of said pivot sectionto said one limiting position to establish said throttle return means insaid normal condition on application of said actuating force andalternatively to be actuated thereby on lateral movement of said pivotsection to said other limiting position to establish said throttlereturn means in said throttle return condition upon removal of said 3.In a vehicle: a. an internal combustion engine; b. a carburetor having athrottle valve for controlling said engine and a throttle lever forpivoting said throttle valvc between an idic position and a lull openposition;

. throttle linkage means connected with said throttle lever forpermitting a vehicle operator to control said engine by moving saidthrottle valve in a throttle opening direction towards said full openposition, said linkage means including a return spring for biasing saidthrottle lever in a throttle closing direction towards said idleposition, a linkage lever having a pivot section, pivot support meansfor supporting said pivot section in one limiting position to pivotabout an axis and permitting lateral movement of said pivot sectionrelative to said axis to another limiting position, biasing means fornormally yieldingly holding said pivot section in said other limitingposition and yielding to movement of said pivot section to said onelimiting position by a throttle actuating force applied to said linkagele ver, and yieldable coupling means including a first and secondthrottle rod, stop means provided by said throttle rods, and a couplingspring for yieldingly engaging said stop means, said throttle rodsconnected respectively to said throttle lever and said linkage lever andcoupling spring normally engaging said stop means so that one of saidlevers may be moved with the other and alternatively yielding to allowsaid stop means to disengage so that said throttle lever may be moved insaid closing direction relative to said linkage lever;

d. throttle return means connected to said throttle lever operable in anormal condition to permit said throttle lever to be normally controlledby said linkage lever and said return spring and alternatively in athrottle return condition to overcome the bias of said coupling springand return said throttle lever to said idle position when said throttlelinkage means is prevented from normally doing so; and

. throttle return control means for controlling said throttle returnmeans and including switch means operatively connected with said linkagelever to be actuated thereby on lateral movement of said pivot sectionto said one limiting position to establish said throttle return means insaid normal condition on application of said actuating force andalternatively to be actuated thereby on lateral movement of said pivotsection to said other limiting position to establish said throttlereturn means in said throttle return condition upon removal of saidactuating force.

4. In a vehicle: a. an internal combustion engine;

h. a carburetor having a throttle valve for controlling said cnginc anda first throttle lever for pivoting said throttle valve between an idleposition an a full open position;

c. throttle linkage means connected with said throttle lever forpermitting a vehicle operator to control said engine by moving saidthrottle valve in a throt tle opening direction towards said full openposi tion, said linkage means including a return spring to: biasing saidfirst throttle lever in a throttle closing direction towards said idleposition, a linkage lever having a pivot section, pivot support meansfor supporting said pivot section in one limiting position to pivotabout an axis and permitting lateral movement of said pivot sectionrelative to said axis to another limiting position, biasing means fornormally yieldingly holding said pivot section in said other limitingposition and yielding to movement of said pivot section to said onelimiting position by a throttle actuating force applied to said linkagelever, a second throttle lever pivotable in a throttle opening directionrelative to said first throttle lever, and yieldable coupling means fornormally coupling said second throttle lever into engagement with saidfirst throttle lever so that said throttle levers normally moveconjointly and alternatively yielding to permit said first throttlelever to be moved in said closing direction relative to said secondthrottle lever;

d. throttle return means connected to said throttle lever operable in anormal condition to permit said throttle lever to be normally controlledby said linkage lever and said return spring and alternatively in athrottle return condition to overcome the bias of said coupling meansand return said throttle lever to said idle position when said throttlelinkage means is prevented from normally doing so; and

e. throttle return control means for controlling said throttle returnmeans and including switch means operatively connected with said linkagelever to be actuated thereby on lateral movement of said pivot sectionto said one limiting position to establish said throttle return means insaid normal condition on application of said actuating force andalternatively to be actuated thereby on lateral movement of said pivotsection to said other limiting position to establish said throttlereturn means in said throttle return condition upon removal of saidactuating force.

V UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.3,757,758 c Q Dated September 11-, 1973 Inventor(s) Donald D. StoltmanIt is certified that error appears in the above identified patent andthat said Letters Patent are hereby corrected as shown below:

Column 4, line 55, "provided" should be --pivoted-,

Column 5, line 23, delete "In taking" first instance,

Column 8, line 63, after "said" insert -actueting orc'e.-

Signed and enabled this 18th day or June 197m (SEAL) Atteat:

EDWARD M.FIETGHER,JR. c. MARSHALL 1mm- Attesting Officer Commissioner ofPatents

1. In a vehicle: a. an internal combustion engine; b. a carburetorhaving a throttle valve for controlling said engine and a throttle leverfor pivoting said throttle valve between an idle position and a fullopen position; c. throttle linkage means connected with said throttlelever for permitting a vehicle operator to control said engine by movingsaid throttle valve in a throttle opening direction towards said fullopen position, said linkage means including a return spring for biasingsaid throttle lever in a throttle closing direction towards said idleposition, a linkage lever having a pivot section, pivot support meansfor supporting said pivot section in one limiting position to pivotabout an axis and permitting lateral movement of said pivot sectionrelative to said axis to another limiting position, biasing means fornormally yieldingly holding said pivot section in said other limitingposition and yielding to movement of said pivot section to said onelimiting position by a throttle actuating force applied to said linkagelever, and yieldable coupling means connected between said throttlelever and said linkage lever and including spring means for normallycoupling one of said levers to move with the other and alternativelyyielding to permit said throttle lever to be moved in said closingdirection relative to said linkage lever when said throttle lever isforced with a bias greater than the bias of said return spring; d.throttle return means connected to said throttle lever operable in anormal condition to permit said throttle lever to be normally controlledby said linkage lever and said return spring and alternatively in athrottle return condition to overcome the bias of said coupling meansand return said throttle lever to said idle position when said throttlelinkage means is prevented from normally doing so; and e. throttlereturn control means for controlling said throttle return means andincluding switch means operatively connected with said linkage lever tobe actuated thereby on lateral movement of said pivot section to saidone limiting position to establish said throttle return means in saidnormal condition on application of said actuating force andalternatively to be actuated thereby on lateral movement of said pivotsection to said other limiting position to establish said throttlereturn means in said throttle return condition upon removal of saidactuating force.
 2. In a vehicle: a. an internal combustion engine; b. acarburetor having a throttle valve for controlling said engine and athrottle lever for pivoting said throttle valve between an idle positionand a full open position; c. throttle linkage means connected with saidthrottle lever for permitting a vehicle operator to control said enginefrom a remote location by moving said throttle valve in a throttleopening direction towards said full open position, said linkage meansincluding a return spring for biasing said throttle lever in a throttleclosing direction towards said idle position, a linkage lever having apivot section, pivot support means for supporting said pivot section inone limiting position to pivot about an axis and permitting lateralmovement of said pivot section relative to said axis to another limitingposition, a throttle pedal for pivoting and laterally moving saidlinkage lever, biasing means for normally yieldingly holding said pivotsection in said other limiting position and yielding to movement of saidpivot section to said one limiting position by a throttle actuatingforce applied to said linkage lever, and yieldable coupling meansconnected between said throttle lever and said linkage lever andincluding spring means for normally coupling one of said levers to movewith the other and alternatively yielding to permit said throttle leverto be moved in said closing direction relative to said linkage lever; d.throttle return means connected to said throttle lever operable in anormal cOndition to permit said throttle lever to be normally controlledby said linkage lever and said return spring and alternatively in athrottle return condition to overcome the bias of said coupling meansand return said throttle lever to said idle position when said throttlelinkage means between said yieldable coupling means and said throttlepedal is prevented from normally doing so; and e. throttle returncontrol means for controlling said throttle return means and includingswitch means operatively connected with said linkage lever to beactuated thereby on lateral movement of said pivot section to said onelimiting position to establish said throttle return means in said normalcondition on application of said actuating force and alternatively to beactuated thereby on lateral movement of said pivot section to said otherlimiting position to establish said throttle return means in saidthrottle return condition upon removal of said
 3. In a vehicle: a. aninternal combustion engine; b. a carburetor having a throttle valve forcontrolling said engine and a throttle lever for pivoting said throttlevalve between an idle position and a full open position; c. throttlelinkage means connected with said throttle lever for permitting avehicle operator to control said engine by moving said throttle valve ina throttle opening direction towards said full open position, saidlinkage means including a return spring for biasing said throttle leverin a throttle closing direction towards said idle position, a linkagelever having a pivot section, pivot support means for supporting saidpivot section in one limiting position to pivot about an axis andpermitting lateral movement of said pivot section relative to said axisto another limiting position, biasing means for normally yieldinglyholding said pivot section in said other limiting position and yieldingto movement of said pivot section to said one limiting position by athrottle actuating force applied to said linkage lever, and yieldablecoupling means including a first and second throttle rod, stop meansprovided by said throttle rods, and a coupling spring for yieldinglyengaging said stop means, said throttle rods connected respectively tosaid throttle lever and said linkage lever and coupling spring normallyengaging said stop means so that one of said levers may be moved withthe other and alternatively yielding to allow said stop means todisengage so that said throttle lever may be moved in said closingdirection relative to said linkage lever; d. throttle return meansconnected to said throttle lever operable in a normal condition topermit said throttle lever to be normally controlled by said linkagelever and said return spring and alternatively in a throttle returncondition to overcome the bias of said coupling spring and return saidthrottle lever to said idle position when said throttle linkage means isprevented from normally doing so; and e. throttle return control meansfor controlling said throttle return means and including switch meansoperatively connected with said linkage lever to be actuated thereby onlateral movement of said pivot section to said one limiting position toestablish said throttle return means in said normal condition onapplication of said actuating force and alternatively to be actuatedthereby on lateral movement of said pivot section to said other limitingposition to establish said throttle return means in said throttle returncondition upon removal of said actuating force.
 4. In a vehicle: a. aninternal combustion engine; b. a carburetor having a throttle valve forcontrolling said engine and a first throttle lever for pivoting saidthrottle valve between an idle position an a full open position; c.throttle linkage means connected with said throttle lever for permittinga vehicle operator to control said engine by moving said throttle valvein a throttle opening direction towards said full open position, saidlinkage means incluDing a return spring for biasing said first throttlelever in a throttle closing direction towards said idle position, alinkage lever having a pivot section, pivot support means for supportingsaid pivot section in one limiting position to pivot about an axis andpermitting lateral movement of said pivot section relative to said axisto another limiting position, biasing means for normally yieldinglyholding said pivot section in said other limiting position and yieldingto movement of said pivot section to said one limiting position by athrottle actuating force applied to said linkage lever, a secondthrottle lever pivotable in a throttle opening direction relative tosaid first throttle lever, and yieldable coupling means for normallycoupling said second throttle lever into engagement with said firstthrottle lever so that said throttle levers normally move conjointly andalternatively yielding to permit said first throttle lever to be movedin said closing direction relative to said second throttle lever; d.throttle return means connected to said throttle lever operable in anormal condition to permit said throttle lever to be normally controlledby said linkage lever and said return spring and alternatively in athrottle return condition to overcome the bias of said coupling meansand return said throttle lever to said idle position when said throttlelinkage means is prevented from normally doing so; and e. throttlereturn control means for controlling said throttle return means andincluding switch means operatively connected with said linkage lever tobe actuated thereby on lateral movement of said pivot section to saidone limiting position to establish said throttle return means in saidnormal condition on application of said actuating force andalternatively to be actuated thereby on lateral movement of said pivotsection to said other limiting position to establish said throttlereturn means in said throttle return condition upon removal of saidactuating force.